All that can presently (September 2019) be gleaned about Otto Frey from sheet music covers and by internet searching is that he has 2 works published between 1911 and 1913.
Of ragtime interest is Ragged Edges (1911) published by Victor Kremer Co., Chicago, Illinois, USA.
Surfers are welcome to contribute information about this composer.
This list is arranged in chronological order and contains 2 works by Otto Frey.
It does not claim to be complete and represents only the number of items located. Keys:ER